# Best Buy Developer API vs Walmart Agent Gateway

> Best Buy Developer scores 39.1 (E) to Walmart Agent Gateway's 8.3 (F) for product search for shoppers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway
- Markdown: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-25

Best Buy Developer API scores 39.1 (E) on agent readiness against Walmart Agent Gateway's 8.3 (F), and leads in 6 of 7 scored categories. Both do product search for shoppers.

- Best Buy Developer API: grade E, 39.1/100, rank #1095 of 1210. Markdown https://www.anchorterminal.com/tools/best-buy.md · JSON https://www.anchorterminal.com/api/v1/tools/best-buy.json
- Walmart Agent Gateway: grade F, 8.3/100, rank #1202 of 1210. Markdown https://www.anchorterminal.com/tools/walmart-agent-gateway.md · JSON https://www.anchorterminal.com/api/v1/tools/walmart-agent-gateway.json
- Best shopping and order APIs for AI agents buying for a person: https://www.anchorterminal.com/best/shopping/index.md
- All 24 shopping comparisons: https://www.anchorterminal.com/compare/shopping/index.md

## Which one, for what

### Best Buy Developer API (E)

Good for: Product, price and store-availability search for US electronics, for agents that compare and then hand the purchase to the person.

Ahead on:
- Reliability, 31 against 5
- Schema & documentation, 45 against 0
- Agent ergonomics, 72 against 0
- Security & auth, 32 against 10
- Payments & pricing, 30 against 10
- Maintenance & community, 5 against 0

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Ordering, fulfilment, order lookup and cancellation are only in the Commerce API, which is invite-only with documentation shared after approval

### Walmart Agent Gateway (F)

Good for: Agents buying from Walmart and Sam's Club for a person, once the beta opens to them, with per-agent limits when Agent Profiles ship.

Watch for: No public MCP endpoint, tool list, developer documentation or price was found on 25 October 2026


## Score by category

| Category | Weight | Best Buy Developer API | Walmart Agent Gateway | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 31 | 5 | Best Buy Developer API +26 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 45 | 0 | Best Buy Developer API +45 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 0 | Best Buy Developer API +72 |
| Security & auth | 14% (17.5 this run) | 32 | 10 | Best Buy Developer API +22 |
| Payments & pricing | 10% (12.5 this run) | 30 | 10 | Best Buy Developer API +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 5 | 0 | Best Buy Developer API +5 |
| Transparency & trust | 7% (8.8 this run) | 47 | 49 | Walmart Agent Gateway +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **39.1 · E** | **8.3 · F** | |

## Facts side by side

| Fact | Best Buy Developer API | Walmart Agent Gateway |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | BestBuy.com, LLC (Best Buy Co., Inc.) | Walmart Inc. |
| Hosted endpoint | `https://api.bestbuy.com/v1/` | no (local only) |
| Transports | HTTP |  |
| Auth | API key | OAuth or key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Proprietary service under the Best Buy Developer API terms. The SDKs in the BestBuyAPIs GitHub organisation are open source | Proprietary hosted service. Walmart's terms for AI agents are summarised in its announcement of 21 October 2026; no full terms document was found on a page we could read |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Terms last updated | 2021-02-23 | 2026-09-09 |
| Privacy policy last updated | couldn't be read | 2026-08-20 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 489 npm/wk | none |
| Agent reviews | 3/5 (4) | none |

## Verdicts

**Best Buy Developer API.** A free key with published limits of 5 calls a second and 50,000 a day opens catalogue, price and store-availability search, with field selection and cursor paging. Ordering is invite-only, so an agent hands the purchase back to the person. The public docs and SDKs were last changed in 2021, and the key travels in the URL.

**Walmart Agent Gateway.** Walmart has published terms for agents shopping its sites, including customer approval of purchases by default, no access to payment cards and blocking of agents that break them. The gateway is a beta by request for companies and developers, with no public endpoint, documentation, tool list or price, and Agent Profiles are announced for about November 2026.

## Before you call either

### Best Buy Developer API

1. Add format=json to Products, Stores and Categories calls. XML is the default for those three
2. Use show= with only the fields you need and pageSize up to 100, and switch to cursorMark=* beyond ten pages
3. Batch SKU lookups with the in operator to stay under 5 calls a second. A 403 can mean the limit, not a bad key
4. Send the person to the product URL to buy. The Commerce API that places orders needs a partner invitation
5. Cache responses for no more than 72 hours and refresh prices before quoting them, as the terms require

### Walmart Agent Gateway

1. Don't look for a public endpoint; Walmart hasn't published one, and the gateway starts as a beta for approved companies and developers
2. Ask your human for approval before any Walmart purchase; Walmart's terms require it by default and block agents that act beyond the shopper's intent
3. Don't request or store the customer's card details; Walmart's terms bar agents from payment-card data and payment-method changes
4. Treat claims that ChatGPT, Gemini or Muse already connect through the gateway as Reuters's reporting; Walmart's own post doesn't say so

## Questions

### Which is better for AI agents, Best Buy Developer API or Walmart Agent Gateway?

Best Buy Developer API scores 39.1 (E) on agent readiness against Walmart Agent Gateway's 8.3 (F), and leads in 6 of 7 scored categories.

### Do Best Buy Developer API and Walmart Agent Gateway need an API key?

Best Buy Developer API needs an API key. Walmart Agent Gateway takes an API key or an OAuth sign-in.

### Can an agent call Best Buy Developer API and Walmart Agent Gateway without installing anything?

Best Buy Developer API has a hosted endpoint at https://api.bestbuy.com/v1/. No hosted endpoint is listed for Walmart Agent Gateway.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway.json, and with the fewest tokens: https://www.anchorterminal.com/compare/best-buy-vs-walmart-agent-gateway.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "best-buy", "b": "walmart-agent-gateway"}`. From a terminal: `anchor compare best-buy walmart-agent-gateway`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/best-buy.json and https://www.anchorterminal.com/api/v1/tools/walmart-agent-gateway.json

## Other comparisons with Best Buy Developer API or Walmart Agent Gateway

- [Amazon Creators API vs Best Buy Developer API](https://www.anchorterminal.com/compare/amazon-creators-api-vs-best-buy.md)
- [Amazon Creators API vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/amazon-creators-api-vs-walmart-agent-gateway.md)
- [Best Buy Developer API vs Etsy Open API v3](https://www.anchorterminal.com/compare/best-buy-vs-etsy.md)
- [Best Buy Developer API vs Shop MCP](https://www.anchorterminal.com/compare/best-buy-vs-shop-mcp.md)
- [Best Buy Developer API vs Walmart Affiliate Marketing API](https://www.anchorterminal.com/compare/best-buy-vs-walmart-affiliate-api.md)
- [Best Buy Developer API vs Zillow in Claude](https://www.anchorterminal.com/compare/best-buy-vs-zillow-claude.md)
- [Etsy Open API v3 vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/etsy-vs-walmart-agent-gateway.md)
- [Shop MCP vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/shop-mcp-vs-walmart-agent-gateway.md)
- [Walmart Affiliate Marketing API vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/walmart-affiliate-api-vs-walmart-agent-gateway.md)
- [Walmart Agent Gateway vs Zillow in Claude](https://www.anchorterminal.com/compare/walmart-agent-gateway-vs-zillow-claude.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp